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1993 XT 225 #148918 09/07/20 07:28 PM
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Woodytoo Offline OP
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I have not been on this site in a while and hope I’ve got this posted in the right spot. The bike has just over ten k on it. Sold to me , and presented itself as well taken care of.
I did the three mods as seen on here many times, except for jetting until now. I drilled the restrictive baffle out at 3/4”
I cut the portion of the snorkel off that lived in the air box.
I removed the anti tamper fuel/ mixture idle screw plug and seated it , then backed it out three turns. I also removed the carb and cleaned it even tho it was pretty clean already. I have since run the bike without problems and have been generally happy with the performance.
The only issue ( and it seems minor) is when the bike is pegged wot at the very top of the rpm range it will cut for a split second and then back on again.
I had ordered up all the jets to fit the bike and decided to see what might work better/ worse. I pulled the main jet and identified it as 130
Thinking maybe the engine needed more fuel because of the improved air/ exhaust flow I put a 135 main in. The cutoff in power was way worse about half throttle all I could get. So I thought ok let’s try 127.5 the condition was better but still cutting off around 3/4 throttle. I reinstalled the 130 and was back to where I started. Actually for the rest of the day it took all the throttle and Rpm I coukd give it. Now it’s back where it’s been. I coukd live with it as all of the throttle and idle response in normal ranges work really well.
I have not pulled the pilot jet ( mid ) to see what size it is yet. Any ideas of where to look for fine tuning the little beast?

Re: 1993 XT 225 [Re: Woodytoo] #148927 09/08/20 01:42 PM
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peejman Online Content
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My first recommendation is to not let it howl along at top speed, it's just not made for that. You'll burn up rings and valves fairly quickly.

It could be that the bowl is running out of fuel. It's gravity fed, so there's only so much fuel flow available. You could pull the line and make sure you've got a steady flow from the tank, or see if full of gas vs. nearly empty makes any difference.


This shall pass, be still and know.
2006 XT225, UNI filter, ProTaper bars, MSR handguards, SS front brake line, Shinko 241's.
Re: 1993 XT 225 [Re: Woodytoo] #148928 09/08/20 03:40 PM
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Woodytoo Offline OP
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Good idea. I do have a small sintered bronze fuel filter in place. Possible that it restricts fuel flow.

Re: 1993 XT 225 [Re: Woodytoo] #148929 09/08/20 05:25 PM
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skypupbob Offline
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I have seen those sintered bronze filters that LOOK fine, but had restricted flow because tiny particles plugged the little passages in the bronze. Again, they looked fine but when you blew through them and a new one , they were way restrictive.
I use the ones with the fine screen in them. All of the debris falls to the bottom corner.
Also peejman is right, the serrow is not a high speed machine. Sure, it will go 70, but for sustained running 55 is mo better!

Re: 1993 XT 225 [Re: Woodytoo] #148930 09/08/20 09:24 PM
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Muniac Offline
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As for inline fuel filters, don't use the cheap Chinese imports made from clear polystyrene. This plastic will crack over time. With the obvious safely hazards. The XT225 red lines at 55 MPH. It isn't designed for sustained high speed travel. Pushing it there simply means shorten the life of its mechanical drive train parts.


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Re: 1993 XT 225 [Re: Muniac] #148950 09/09/20 06:53 PM
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Woods Walker Offline
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Originally Posted by Muniac
As for inline fuel filters, don't use the cheap Chinese imports made from clear polystyrene. This plastic will crack over time. With the obvious safely hazards. The XT225 red lines at 55 MPH. It isn't designed for sustained high speed travel. Pushing it there simply means shorten the life of its mechanical drive train parts.


Didn't you say you could do 55MPH with the 15/58 gearing ? Is 55 with your gearing really pushing it too far for any kind of distance ? Just wondering if 15/50 gearing would be too low to maintain about 60 for any length of time without adverse effects to the engine ?

Re: 1993 XT 225 [Re: Woodytoo] #148955 09/09/20 09:32 PM
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Muniac Offline
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Yes I did say that. Some of the trail riding we did required short jaunts on highways. Either to get to a trail head or return via a highway route. We'd run the bikes at 55 MPH for 20-30 minutes infrequently. You can do the math on gear ratios and figure the increased engine RPM changing from 15:50 (stock) to a lower 15:58 (trail). In our case, probably 95% of the riding we did was off road on trails. The bikes were specifically setup for that type of riding. At the expense of highway cruising.

It's been said, "If you want to rock, keep it stock!" There is some truth in that. The XT225 as a dual sport bike handles on/off road riding reasonably well. Doing neither as an "expert" so you live with reasonable compromises according to the ratio of trail to highway riding. If it's about 50/50, I'd leave the bike stock as it does pretty well. It red lines at 55 MPH and is comfortable at 50 MPH for extended periods of time. Use full synthetic oil and change it every 500 miles as we always did.

If you lean heavily toward trail riding, you can improve the bike's performance in those riding conditions. To start with lower the gearing. There's a tech bulletin on lower gearing in the Learning Center. The perks on the trail will become higher engine revs if you need to go 50-55 MPH. Tire tread pattern comes into play too. If you're not riding on the highway, you can get some aggressive knobby tires which work much better in trail conditions. Some even use a trials tire on the rear. Lower tire pressures work better on the trails.

Your mileage will vary as a rider so you need to experiment and find a comfortable balance that works for you.

[Linked Image from photos.smugmug.com]
15:58 gearing helps paddling up sections like this. (Arizona Strip, AZ)

[Linked Image from photos.smugmug.com]
Slow and under control avoids going over the bars coming down this wash step. (Arizona Strip, AZ)
Engine off, 1st gear and clutch as brake allows both feet for tripod support. Front brake is a bad idea here as it causes the front forks to dive. You'll hit the bash plate too which can throw your balance off. Devil is always in the details.


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Re: 1993 XT 225 [Re: Muniac] #149023 09/16/20 04:09 AM
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Craig1 Offline
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Originally Posted by Muniac
The XT225 red lines at 55 MPH. It isn't designed for sustained high speed travel. Pushing it there simply means shorten the life of its mechanical drive train parts.


I believe the red area on the speedometer is a hold over from when the national speed limit was 55mph. I have seen the same on speedometers of much larger bikes capable of over 100mph.
I agree 55mph is the fastest cruising speed for the XT225. As a rule of thumb, cruising speed should be no more than 75% of top speed.

Re: 1993 XT 225 [Re: Woodytoo] #149027 09/16/20 03:34 PM
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Muniac Offline
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Good point. I forgot about that government initiative slogan "55 saves lives". Which depends on a lot of things. Like someone doing 55 in the left lane when everybody else wants to do 70. Either way 55 MPH on that bike is plenty fast and a reasonable top end to not exceed for long rides. At that speed, it's amazing how light that bike feels. It's all about good judgement. Ride safely.


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